linux-kernel - Re: [PATCH v3] xen/privcmd: add IOCTL_PRIVCMD_MMAP

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Message-ID: <bd84cd4b-1834-b631-303c-3e190ad7676d@oracle.com>
Date:   Mon, 9 Apr 2018 12:36:25 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Paul Durrant <paul.durrant@...rix.com>,
        xen-devel@...ts.xenproject.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Juergen Gross <jgross@...e.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH v3] xen/privcmd: add IOCTL_PRIVCMD_MMAP_RESOURCE

On 04/09/2018 05:36 AM, Paul Durrant wrote:
> My recent Xen patch series introduces a new HYPERVISOR_memory_op to
> support direct priv-mapping of certain guest resources (such as ioreq
> pages, used by emulators) by a tools domain, rather than having to access
> such resources via the guest P2M.
>
> This patch adds the necessary infrastructure to the privcmd driver and
> Xen MMU code to support direct resource mapping.
>
> NOTE: The adjustment in the MMU code is partially cosmetic. Xen will now
>       allow a PV tools domain to map guest pages either by GFN or MFN, thus
>       the term 'mfn' has been swapped for 'pfn' in the lower layers of the
>       remap code.
>
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@...cle.com>

I think this will have to wait until 4.18 though, it's somewhat late for
current merge window right now.

-boris